InstallHinfSection question

[Deneb]

Hello,

I try to install a TDI driver on windows xp, that worked until now when I am running

VOID WINAPI InstallHinfSectionA( __in HWND Window, __in HINSTANCE ModuleHandle, __in PCSTR CommandLine, __in INT ShowCommand )

with a CommandLine having length of MAX_PATH+1. I get a popup saying "Installation failed". Is there any limitation to the length of the path?